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Unlocking phone NUC number

I am trying to unlock my daughter’s phone so we can use a non-Vodafone sim. However, it would seem that the NUC number I have been given is the wrong one - went into a Vodafone shop today hoping to resolve the ongoing unlocking phone issues and was told to get this escalated and request a new NUC number. So I went onto live chat and was told to fill in the form again- which I have now done. Is there anything else I can do? This has been going on for almost a month now!